grade-school: Expect Option<Vec<String>> from grade; add stub file#256
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petertseng merged 2 commits intoexercism:masterfrom Feb 13, 2017
petertseng:grade-school
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grade-school: Expect `Option<Vec<String>>` from grade; add stub file#256petertseng merged 2 commits intoexercism:masterfrom petertseng:grade-school
petertseng merged 2 commits intoexercism:masterfrom
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